[Bug 1571416]

Patch has been submitted to mesa-dev:

https://lists.freedesktop.org/archives/mesa-dev/2016-May/115453.html

and Reviewed-By Christian König

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https://bugs.launchpad.net/bugs/1571416

Title:
System freezes shortly after reaching the desktop (Ubuntu MATE 16.04,
PowerPC)

Status in Linux:
Confirmed
Status in linux package in Ubuntu:
Confirmed

Bug description:
The freeze happens every time unless I use "radeon.agpmode=-1" as a
kernel parameter.

Affected machines:
PowerBook G4 5,6 + PowerMac G5 7,3 (w. "ATI Radeon 9600 AP (AGP)".

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-18-powerpc-smp 4.4.0-18.34
ProcVersionSignature: Ubuntu 4.4.0-18.34-powerpc-smp 4.4.6
Uname: Linux 4.4.0-18-powerpc-smp ppc
ApportVersion: 2.20.1-0ubuntu2
Architecture: powerpc
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CasperVersion: 1.373
CurrentDesktop: MATE
Date: Sun Apr 17 21:08:40 2016
IwConfig:
 lo no wireless extensions.

 enP2p36s15f0 no wireless extensions.
LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release powerpc (20160417.1)
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: ro ramdisk_size=1048576 file=/cdrom/preseed/username.seed boot=casper quiet --- radeon.agpmode=-1
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-18-powerpc-smp N/A
 linux-backports-modules-4.4.0-18-powerpc-smp N/A
 linux-firmware 1.157
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

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